Seventh International WMO Symposium on Data Assimilation

Worldwide established and early career scientists are convening in Brazil to address the challenges and trigger innovations on advanced data assimilation methods for a wide spectrum of applications in atmospheric, oceanic and earth system science.

Symposium Goals

In the Symposium the state of the art of data assimilation for weather and climate prediction will be presented. The aim of the Symposium is to gather a worldwide representation of well established scientists as well as early career scientists to create opportunities of discussion, to establish common areas of interest and future mutual collaborations to advance data assimilation.

Data assimilation themes include advancing assimilation methodologies and ensemble data assimilation methods; assessment of model and assimilation systems uncertainties; data assimilation performance assessment and diagnostic tools used; couple-state (atmosphere/ocean, atmosphere/land, atmosphere/cryosphere) data assimilation methodology; polar and tropical data assimilation issues and solvers; impact assessment of the observations used and observations needed in the future; representation of high-impact weather phenomena from tropical cyclones to urban smog; convective scale data assimilation methodology and observations; assimilation of different atmospheric constituents.

Themes in summary:

  • - Global and Regional Atmospheric
  • - Convective Scale
  • - Atmospheric Constituent
  • - Coupled
  • - Global and Regional Ocean
  • - Assimilation of Observations to Represent the Land Surface Evolution
  • - Assimilation of Space-Based Remote Sensing, Ground-Based Remote Sensing and in Situ Observations
  • - Methodology
  • - Assimilation System Performance Diagnostic

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Global and Regional Atmospheric

(e.g. troposphere, stratosphere, high impact weather, reanalysis)

Convective Scale

(e.g. to initialize high resolution NWP, nowcasting, high impact weather)

Atmospheric Constituent

(e.g. stratospheric and tropospheric composition, aerosols, air quality, reanalysis)


(e.g. atmosphere/land, atmosphere/ocean, ocean/wave, land/ocean/sea-ice, carbon cycle, reanalysis, initializing seasonal to decadal predictions)

Global and Regional Ocean

(e.g. coastal, reanalysis, operational oceanography, salinity, ocean chlorophyll, biogeochemical)

Assimilation of Observations to Represent the Land Surface Evolution

(e.g. novel variables such as soil moisture, skin temperature)

Assimilation of Space-Based Remote Sensing, Ground-Based Remote Sensing and in Situ Observations

(e.g. new observation operators, observation and model bias correction, observation and model error variance specification, future network design and observation impact, adaptive observational thinning, observations use in cloudy and precipitating areas)


(e.g. improvements to existing variational, EnKF, and hybrid methods; new approaches for estimating error covariances; techniques for highly non-Gaussian systems; long window/weak constraint; new methods for optimizing re-analyses; variational/ensemble parameter estimation; improving scalability of DA methods; other advanced techniques including those tested with idealized systems)

Assimilation System Performance Diagnostic

(e.g. observation influence, observation departures, analysis residuals, analysis uncertainties, observation forecast departures, adjoint and ensemble forecast sensitivity observation impact, observation system experiment, observation simulation system experiment, observation impact monitoring for climate applications)


Important Dates

  • 6 March 2017: Abstract Submission Open
  • 14 April 2017: Abstracts Due
  • 27 April 2017: Abstracts Due
  • 16 June 2017: Abstract Notification Sent
  • 31 July 2017: Early Bird Registration
  • 31 August 2017: Last Day for Hotel Booking
  • 05 September 2017: Final Program
  • 11-15 September 2017: Symposium

Registration Fees

Until July 31, 2017 After August 1st, 2017 On-Site
Participant US$ 200 US$ 250 US$ 300

Abstract Fee

Abstract Fee US$ 20

Registration/Abstract Submission

Authors are invited to submit abstracts (800 words - max 1 page A4) in electronic form until 27 April 2017. Submitted abstracts should include title, authors, address, body of abstract, and six key words. Please list the full first and last names of each author. Abstracts must concisely describe the study or topic in detail.


With the aim to gather presentations that represent the most innovative ideas and developments in data assimilation, and also with the aim to offer opportunities to early career scientists and scientists from less developed countries, a set up of equal length oral presentations has been chosen from the submitted abstracts. The Symposium program consists of seventy-five 20' talks and one-hundred-fifty posters that represent the state of the art in data assimilation methodologies and applications. A plenary session is organized on the last day of the Symposium to provide a summary of the main achievements shown in this field and suggestions for further investigations and opportunities for improvements.

8:30 AM Opening Remarks, WMO, Other information
Season 1 Chair Global and Regional Atmospheric DA
8:50 AM Dale Barker Met Office Data Assimilation Capabilities: Now And For The Future
9:10 AM Cecile Loo Evolution of the global data assimilation at Météo-France
9:30 AM Mark Buehner 4D Ensemble-Variational Data Assimilation System for High-Resolution NW
9:50 AM Vijay Tallapragada Next Generation Unified Global Modeling System Development at NCEP: Implementation Strategies for FV3GFS
10:10 AM Coffee/Tea Break
Season 2 Chair Global and Regional Atmospheric DA
10:40 AM Cathy Thomas Adopting NCEP’s Hybrid 4DEnVar data assimilation system to the FV3-GFS
11:00 AM Andrew Lorenc Improving the Met Office's four-dimensional hybrid-variational data assimilation
11:20 AM Dan Holdaway Development of the non-hydrostatic FV3 dynamical core adjoint and its use in the GMAO Hybrid 4DVAR system
11:40 AM Carlos Frederico Bastarz GSI based hybrid 3DEnVar data assimilation for the CPTEC-INPE BAM Global model
12:00 PM Lunch
Session 3 Chair: Oceanic DA, Global and Regional Atmospheric DA
1:30 PM Scott Smith From 3dvar to 4dvar data assimilation: improving forecast accuracy using the Navy coastal ocean model (NCOM)
1:50 PM Clemente A. S. Tanajura The REMO ocean data assimilation system (RODAS) into HYCOM in a nested grid configuration over the Atlantic Ocean
2:10 PM Keiichi Kondo Exploring localization for multiscale dynamics and satellite radiances with real observations using the global non-hydrostatic atmospheric model NICAM
2:30 PM Yan Liu Development and Experiments of GRAPES 4D-Var System
2:50 PM Afternoon Break/Posters (Batch 1)
Session 4 Chair: Global and Regional Atmospheric DA
4:00 PM Jeffrey S. Whitaker Parameterizing model uncertainty due to unresolved dynamics using randomized transport
4:20 PM Jean Francois Caron Scale-Dependent Localization in Ensemble-Variational Data Assimilation: Application in Global and Convective-Scale NWP systems
4:40 PM In-Hyuk Kwon Development of Hybrid-4DEnVar system at the KIAPS
5:00 PM Massimo Bonavita Another look at non-linear, non-Gaussian effects in the ECMWF variational data assimilation system
5:20 PM Wrap up summary and discussion
Season 4 Chair Oceanic DA/Methodology
8:30 AM James While Recent Developments in Ocean Data Assimilation using NEMOVAR at the Met Office
8:50 AM Testut Charles-Emmanuel Recent advances in the Mercator-Ocean reanalysis system: Application to an Arctic configuration
9:10 AM Daiane Gracieli Faller Projeto Azul: A new frontier towards the operational oceanography in Santos Basin using variational data assimilation
9:30 AM Emmanuel Cosme Accounting for spatial correlations of observation error in data assimilation: Application to the future SWOT High-Resolution altimeter mission
9:50 AM Gerald Desroziers Development of a global 4DEnVar system at Météo-France
10:10 AM Coffee/Tea Break
Season 6 Chair Methodology
10:40 AM Anna Shlyaeva Differently observed scales and ensemble covariance localization
11:00 AM Bo Huang On the use of Valid Time Lagged (VTL) Ensembles to increase ensemble size in the GFS hybrid 4DEnVar system
11:20 AM Alberto Carassi Estimating model evidence using data assimilation
11:40 AM Abhishek Shah A fully probabilistic data assimilation approach for range-limited observations
12:00 PM Lunch
Session 7 Chair: Observations/Sat/In-Situ/Radar
1:30 PM Marta Janiskova Challenges and potential benefits of assimilation of space-borne radar and lidar observations in a global numerical weather prediction system
1:50 PM Ulrich Lohnert TOPROF: A European COST initiative for improving weather forecasts by emerging ground-based profiling networks
2:10 PM Chunxiang Shi Researching progress of multi-source data fusion weather grid products
2:30 PM Shunji Kotsuki Ensemble-Based Data Assimilation of GPM/DPR Reflectivity into the Nonhydrostatic Icosahedral Atmospheric Model NICAM
2:50 PM Afternoon Break/Posters (Batch 1)
Session 8 Chair: Convective Scale DA
4:00 PM Martin Weissmann What observations do we need for convective-scale data assimilation?
4:20 PM Fabrice Duruisseau A Bayesian framework for the all-sky assimilation of SAPHIR/Megha-Tropiques observations within the Meteo-France global model ARPEGE
4:40 PM Therese Ladwig Development of the High-Resolution Rapid Refresh Ensemble (HRRRE): A Storm-Scale Ensemble System Including Radar and Cloud Assimilation
5:00 PM Guo-Yuan Lien 30-second-cycle LETKF assimilation of phased array weather radar data
5:20 PM Wrap up summary and discussion
Season 9 Chair Methodology, Covective scale DA
8:30 AM Flavia Rodrigues Pinheiro Nonlinear data assimilation using synchronisation in a particle filter
8:50 AM Anne Sofie Walter A Stable Localized Particle Filter (LPF) for the Global Weather Prediction Model ICON
9:10 AM Craig Bishop The GIGG-Delta filter: Data Assimilation System with skewed uncertainty distribution like cloud, precipitation, fire and ice
9:30 AM Jacques Blum Nudging-based observers for joint state-parameters estimation
9:50 AM Gareth Dow The new hourly 4D-Var system for the Met Office operational convective-scale UKV model
10:10 AM Coffee/Tea Break
Season 10 Chair Convective Scale DA
10:40 AM Tijana Janjic Approaches to convective scale DA
11:00 AM Thibaut Montmerle Implementation of En-Var data assimilation systems for the AROME NWP system at convective scale
11:20 AM Heiner Langer Characterizing Noise and Spurious Convection in Convective Data Assimilation
11:40 AM Yann Michel Flow-Dependent Localization in Ensemble-Variational Data Assimilation: Application in a Convective-Scale NWP system
12:00 PM Lunch
Session 11 Chair: Observations/Sat/In-Situ/Radar
1:30 PM Ron Gelaro/Will McCarty Observing system science at NASA/GMAO in support of low-Earth orbiting micro-satellite constellations
1:50 PM Nadia Fourier Toward a better use of IASI over land and in cloudy areas in Météo-France NWP models at global and meso scales
2:10 PM Fuqing Zhang Ensemble-based convection-permitting assimilation of all-sky satellite radiances
2:30 PM Ting-Chi Wu Assimilation of Microwave All-Sky Radiances and Hydrometeor Retrievals in the Hurricane Weather Research and Forecasting System
2:50 PM Afternoon Break/Posters (Batch 2)
Session 12 Chair: Observations/Sat/In-Situ/Radar, Reanalysis & Climate
4:00 PM Katrin Lonitz Recent improvements in the all-sky assimilation of microwave radiances
4:20 PM Jelena Bojaroval Scale-dependent decomposition of variability (application to UERRA cloud cover analysis)
4:40 PM Sammy Metref Attribution of climatic events using a data assimilation-based formulation of model evidence
5:00 PM Yuki Kosaka The ECMWF Coupled Climate Reanalysis
5:20 PM Wrap up summary and discussion
Season 13 Chair Observations/Sat/In-Situ/Radar
8:30 AM Silke May Assimilation of Reconstructed Radiances from Principal Component compressed Hyperspectral Sounder IASI data in the ICON EnVar
8:50 AM Karina Apodaca Implementation of the GOES-16 GLM lightning assimilation into the GSI system for improved global and convective-scale assimilation and prediction
9:10 AM Thamiris L. de O. Brandao Campos Assimilation of GPS Precipitable Water Vapor estimates using high-resolution model to study squall line events
9:30 AM Susan Rennie Doppler radar wind observations for high resolution data assimilation
9:50 AM Leonhard Scheck Using visible satellite images in convective-scale data assimilation
10:10 AM Coffee/Tea Break
Season 14 Chair Methodology
10:40 AM Oliver Guillet Modelling observation error correlations using a diffusion operator on unstructured grids
11:00 AM Rosangela S. Cintra Supervised neural network for data assimilation on atmospheric general circulation model
11:20 AM Michael Tsyrulnikov The Hierarchical Bayes Ensemble Kalman Filter
11:40 AM Amos S Lawless The conditioning of variational data assimilation with correlated observation errors
12:00 PM Lunch
Session 15 Chair: Diagnostics/OSE/OSSE
1:30 PM Amal El Akkroui An evolved-ensemble approach for representing model uncertainty within hybrid variational DA
1:50 PM Ping Du A new method for evaluating "Forecast Sensitivity Observation Impact" (FSOI) within EnVar
2:10 PM Ricardo Todling Comparing the adjoint- and ensemble-based approaches to observation impact on forecasts
2:30 PM Carla Cardinali Forecast sensitivity observation impact diagnostic tool with an observation-based objective function
2:50 PM Afternoon Break/Posters (Batch 2)
Session 16 Chair: Diagnostics/OSE/OSSE, Land Surface
4:00 PM Loik Berre Simulation and diagnosis of observation, model and background error contributions in data assimilation cycling
4:20 PM Ron Errico Design, Validation, and Application of the GMAO OSSE Framework Using the High Resolution GEOS-5 Nature Run
4:40 PM Eugenia Kalnay New Applications of Data Assimilation: Results
5:00 PM Bianca Buss Maske Use of soil moisture data assimilation in the operational CPTEC/INPE global model for drought monitoring
5:20 PM Wrap up summary and discussion
Season 17 Chair Land Surface, Methodology, Coupled DA
8:30 AM Sanita Vetra-Carvalho Comparison of ensemble and particle filter based data assimilation methods for land surface models using JULES in EMPIRE
8:50 AM Yannick Tremolet A Unified Software Infrastructure for Data Assimilation
9:10 AM Lars Nerger Building a Scalable Ensemble Data Assimilation System for Coupled Models
9:30 AM Hans Ngodock Coupled Ocean-Atmosphere 4D-Var: Formulation and Sensitivity Analysis Results
9:50 AM Saroja Polavarapu Greenhouse Gas Source Estimation with a Coupled Weather and Tracer Transport Model
10:10 AM Coffee/Tea Break
Season 18 Chair Constituent DA
10:40 AM Melanie Ades The Copernicus Atmosphere Monitoring data assimilation system
11:00 AM Sebastian Massart Can the assimilation of atmospheric constituents improve the weather forecast?
11:20 AM Virginie Buchard Assimilation of Aerosol Observations in the NASA GEOS model
11:40 AM Junjee Liu Application of the local Ensemble Transform Kalman filter in CO2 flux estimation with satellite CO2 observations and its comparison with 4D-Var
12:00 PM Final wrap-up and conclude


Scientific Steering Committee

  • Carla Cardinali, Co-Chair
  • Daryl Kleist, Co-Chair: NOAA/NWS/NCEP
  • -
  • Tom Auligne (JCSDA)
  • Mark Buehner (Env. Canada)
  • Nadia Fourrie (Meteo France)
  • Stefan Klink (DWD)
  • Ulrich Lohnert (Univ. Koln)
  • Sharan Majumdar (Univ. of Miami)
  • Saroja Polavarapu (Env. Canada)
  • Juan Ruiz (CIMA-UBA, Argentina)
  • Bing Wang (Chinese Academy of Sciences)

Local Organizing Committee

  • Dirceu Herdies, Co-Chair: CPTEC/INPE
  • Luis Gustavo Gonçalves, Co-Chair: CPTEC/INPE
  • -
  • Antonio Divino Moura - CPTEC/INPE
  • Cesar Augustus Beneti - SIMEPAR
  • Fabricio Harter - UFPEL
  • Francisco de Assis Diniz - INMET
  • Mario Francisco Leal de Quadro - IFSC
  • Pedro Leite da Silva Dias - IAG/USP

Venue and Hotel Reservation

Access the Costão do Santinho hotel site:

Hotel Reservation: Full Board included – US$ 142 per Night - Make your reservation: here.

Getting to Florianópolis

By Air

Florianopolis has its own airport, Hercilio Luz Airport, located on the island. All major Brazilian airlines fly to Florianopolis. If you are flying from outside of the country, it is likely that you will have to make a connection, probably in Sao Paulo or Rio de Janeiro. Make sure when you are booking your flight that your connecting flight to Floripa leaves from the same airport as your arriving flight, as both cities have more than one major airport, and transfering between them can be a great hassle. GOL airlines is a cut-rate airline company similar to Ryanair and EasyJet that flies to Florianopolis.

The best way to get from the airport to your hotel is by taxi. Taxi drivers in Florianopolis are honest and reliable. The ride from the airport into town costs about R$60 ($30 USD). There is also frequent local bus service to the downtown terminal via green busses marked "183 Corredor Sudoeste." Take those marked "Directo" with a placard in the window to avoid most intermediate stops in either direction. The fare is R$2.70 or about $1.25 USD.

By Bus

Overnight buses are available to travel to Florianopolis from both Rio and Sau Paulo. The trip takes about ten hours from Sao Paulo, and eighteen from Rio. You can pay a little more to upgrade to a sleeper bus, which is more comfortable. From Sao Paulo, a standard bus costs around R$70, and a sleeper bus costs about R$120. From Rio the cost is about R$142.

Travel Grants

Junior scholars, senior graduate students and scholars from low-income countries are encouraged to apply to travel assistance before May 10th, 2017. Please, after submitting your abstract, send an email to with the subject “Travel Grant Request”, along with a short CV, one paragraph stating your current research and a letter of reference.

Award decisions will be announced in mid-June.

Please Note: You are not required to Register for the Symposium to apply for a travel grant but an abstract has to be submitted before apply. If you receive a grant you will be required to register for the Symposium by our September 1st, 2017 registration deadline.

*Travel grants are subject to funding availability.


Visa Entrances in Brazil

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Other (Unofficial) Information




Dirceu Herdies

Tel.: +55 (12) 3186-8565

Luis Gustavo Gonçalves

Tel.: +55 (12) 3186-7963